A film with questions to answer rather than answers to give. Its central concerns are feminism and formalism.

Laura Mulvey and Peter Wollen's film addresses the position of women in patriarchy through the prism of psychoanalysis. Riddles of the Sphinx (1977) draws on the critical writings and investigations by both filmmakers into the codes of narrative cinema, and offers an alternative formal structure through which to consider the images and meanings of female representation in film.

The film is constructed in three sections and 13 chapters, combining Mulvey's own to-camera readings around the myth of Oedipus's encounter with the Sphinx with a series of very slow 360 degree panning shots encompassing different environments, from the domestic to the professional. Louise, the narrative's female protagonist, is represented through a fragmented use of imagery and dialogue, in an attempt to break down the conventional narrative structures of framing and filming used to objectify and fetishise women in mainstream cinema. This could be seen as a formal development of the Lacanian analyses that Mulvey had applied to the female image in film in essays such as 1975's 'Visual Pleasure and Narrative Cinema' (in Screen).

Riddles of the Sphinx attempts to construct a new relationship between the viewer and the female subject, presenting her through multiple female voices and viewpoints. The dialogue, constructed from the different voices of Louise, her friends and fellow workers, brings a shifting and ambiguous range of meanings to the film, in contrast to the explanatory authority associated with a conventional voice-over. Other voices and images from outside the film's narrative world also question and disrupt pre-supposed meanings and symbols of the woman within and without the screen; from the mythical enigma of the Sphinx to the appearances of artist Mary Kelly and Mulvey herself.

As Mulvey herself subsequently put it, "What recurs overall is a constant return to woman, not indeed as a visual image, but as a subject of inquiry, a content which cannot be considered within the aesthetic lines laid down by traditional cinematic practice."